﻿<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>循环性能优化</title>
		<script type="text/javascript">
		var x1 = 5, x2 = '3', x3, x4, x5;
		x3 = x1 + x2; x4 = x2 * x1; x5 = x2<<x1;
		alert(typeof x3 + "----" + x3);
		alert(typeof x4 + "----" + x4);
		alert(typeof x5 + "----" + x5);
		</script>
	</head>
	<body>
	</body>
</html>